Sprite classes of 2D to 3D

[Tio Akima]

I've watched Olrox using 3D models for subsituir the 2D sprites of classes
 
It is possible to replace all 2D sprites (classes) for 3D models?
 
for example, putting a 3D model for the Monk class
 
if possible, how to do it?
 
Or perhaps use another route, using a 3D monster and the player take on this way ... I do not know, can be a way forward ...
 
thanks